Wavelength converting particle, method for manufacturing wavelength converting particle, and light emitting diode containing wavelength converting particle
View Patent ↗Provided are a wavelength converting particle, a method for manufacturing a wavelength converting particle, and a light-emitting diode containing a wavelength converting particle. The wavelength converting particle comprises an organic/inorganic/hybrid perovskite nanocrystal that converts a wavelength of light generated by an excitation light source into a specified wavelength. Accordingly, it is possible to optically stabilize and improve color purity and light-emission performance without changes in a light-emitting wavelength range.
1. A wavelength-converting particle comprising:
one or more nanocrystals of a perovskite having a nanocrystal size greater than 10 nm and smaller than 300 nm that is configured to absorb light having a first wavelength and emit light having a second wavelength, wherein the second wavelength of the light emitted from the perovskite does not change substantially over the nanocrystal size thereof unlike a quantum dot that substantially changes a wavelength of light emitted therefrom over a nanocrystal size thereof; and
a plurality of ligands attached to the one or more nanocrystals and configured to make the one or more nanocrystals more dispersible than without such ligands in a medium.
2. The particle of claim 1 , wherein the one or more nanocrystals of the perovskite having a nanocrystal size greater than 10 nm and smaller than 300 nm have a band gap ranging from 1 eV to 5 eV.
3. The particle of claim 1 , wherein the plurality of ligands attached to the one or more nanocrystals surround the one or more nanocrystals.
4. The particle of claim 3 , wherein the ligands comprises alkyl halides.
5. The particle of claim 1 ,
wherein the perovskite has a crystal structure of A 2 BX 4 , ABX 4 , ABX 3 , or A n-1 B n X 3n+1 (n is an integer ranging from 2 to 6); and
wherein A is organic ammonium or cation, B is a metal, and X is a halogen.
6. The particle of claim 5 , wherein:
wherein A is (CH 3 NH 3 ) n , ((C x H 2x+1 )nNH 3 ) 2 (CH 3 NH 3 ) n , (RNH3)2, (C n H 2n+1 NH 3 ) 2 , (CF 3 NH 3 ), (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 , metal, or (C n F 2n+1 NH 3 ) 2 , wherein “n” is an integer greater than or equal to 1, and “x” is an integer greater than or equal to 1;
wherein B is a divalent transition metal, a rare earth metal, an alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof; and
wherein X is Cl, Br, I, or a combination thereof.